Sexuality is not "part of the equation" when saying you are married. Except when it comes to saying you are gay and married. IANAL, but it is almost like the law was written to disproportionately harm one group and not the other. But that would mean it is a "don't say gay" law after all.
You can read the law as equally affects everyone, but that is simply false. Even if you really wanted to "well actually" the situation, I'd love for you to find a Florida da/judge/jury/whatever that would prosecute a straight, young, newly-married kindergarten teacher for have a picture of their family on their desk.
In short, it is de jure anti-gay with a thin veneer of deniability. And even if you were willing to play along with that veneer it is still de facto anti-gay.